At 3 p. m., a hot coal was pulled out of a furnace and allowed to cool at room temperature (75°f). if, after 10 minutes, the temperature of the coal was 475°f, and after 20 minutes, its temperature was 395°f, find the following.

(a) the temperature of the furnace.
°f

(b) the time when the temperature of the coal was 105°f. (round your answer to the nearest minute.)
: p. m.

Around faucet handle is part of a(n) a. lever b. screw c. inclined plane d. wheel and axle

Askydiver weighing 140 lb (including equipment) falls vertically downward from an altitude of 19,000 ft and opens the parachute after 18 s of free fall. assume that the force of air resistance, which is directed opposite to the velocity, is of magnitude 0.55|v| when the parachute is closed and is of magnitude 14|v| when the parachute is open, where the velocity v is measured in ft/s. assume that acceleration due to gravity has magnitude 32 ft/s/s; remember that weight is the product of mass and gravitational acceleration. (a) find the speed of the skydiver when the parachute opens. (b) find the distance fallen before the parachute opens. (c) what is the limiting velocity vl after the parachute opens? (d) determine how long the sky diver is in the air after the parachute opens. (e) plot the graph of velocity versus time from the beginning of the fall until the skydiver reaches the ground.

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